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Since it is only used in one place, there is no reason for this
(deprecated) UI component to be in shared WebUI code.

As a result of this CL bubble_button.js/css is no longer part of the
build in non-CrOS, and in CrOS is inlined within arc_suport/main.html
as a result of the |flattenhtml| usage on that file.

Bug: None
Change-Id: I9838bc4a9a6b71370fbc212d1e189311045b0813
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643091
Auto-Submit: dpapad <dpapad@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846200}